Gigabit PoE Shield

The Gigabit PoE Shield gives OpenMV Cams with on-board Ethernet a single-cable power-and-network connection over 802.3af PoE, while sustaining gigabit link speeds for high-bitrate streaming.

Gigabit PoE Shield

For full datasheet, photos, and ordering see the Gigabit PoE Shield product page.

Highlights

  • 10/100/1000 Mb/s Gigabit Ethernet

  • IEEE 802.3af PoE delivering up to ~6 W to the camera

  • 1500 V isolated design

  • Peak UDP transmit performance over 500 Mb/s

  • Ideal-OR’ing diode for stacking with dual-header shields

  • Compatible with the OpenMV N6 and RT1062

Pinout

Gigabit PoE Shield Pinout

Pin reference

10/100 Mb/s only uses the MDI TX and MDI RX pairs (Pairs A and B). Gigabit (1000BASE-T) is bidirectional on all four pairs A/B/C/D, so the MDI TX ± and MDI RX ± lines double as Pair A and Pair B at gigabit speeds, and Pairs C and D carry the additional gigabit-only pairs.

Pin

Function

MDI LED

PHY link / activity LED line

MDI TX P / DA P

Pair A positive — MDI TX+ at 10/100, BI_DA+ at gigabit

MDI TX N / DA N

Pair A negative — MDI TX− at 10/100, BI_DA− at gigabit

MDI RX P / DB P

Pair B positive — MDI RX+ at 10/100, BI_DB+ at gigabit

MDI RX N / DB N

Pair B negative — MDI RX− at 10/100, BI_DB− at gigabit

DC P

Pair C positive (BI_DC+) — gigabit only

DC N

Pair C negative (BI_DC−) — gigabit only

DD P

Pair D positive (BI_DD+) — gigabit only

DD N

Pair D negative (BI_DD−) — gigabit only

VIN out

5.6 V at up to ~1 A from the on-board PoE regulator (powers the camera)

3.3V rail

Powers the shield’s on-board electronics

GND rail

Common ground

Usage

When the shield is connected to a PoE switch, the camera’s gigabit PHY appears as a network.LAN interface. DHCP runs automatically once the link comes up:

import network
import time

lan = network.LAN()
lan.active(True)
while not lan.isconnected():
    time.sleep(1)
print("Ethernet IP:", lan.ipconfig("addr4")[0])

Warning

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